I have got three PCs connected to internet through a router via switch. IP addresses are allocated to the computers via DHCP. I do have router access password but I can't access configuration mode of the router to configure it using enable command. can anybody suggest the possible reason??

what router is it?

i suggest you type in your default gateway address into a web browser to access it. example: 192.168.2.1

A secure connection might be required (https://192.168.1.1 for most). Also some routers can only be access through certain ports like a specific management port.

Thanks for ur reply.

But I have done it.What I wanna ask is why can't I access it through CUI interface. Enable command for configuration mode simply doesn't work. Is it because the static I.P allocated to the router is still with the router and my PC is using IP allocated by DHCP??

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